Space suit visors are primarily constructed from polycarbonate. This robust material forms the main shell of the extravehicular visor assembly, providing a crucial layer of protection for astronauts during spacewalks.
The Structure of an Extravehicular Visor
Based on the provided reference, a typical extravehicular visor system used over the pressure helmet includes several key components:
- Polycarbonate Shell: This is the core structural component, serving as the base.
- Pivoting Visors: Attached to the polycarbonate shell are at least two additional visors:
- One designed specifically for micrometeoroid protection.
- One designed for protection from the sun's rays (light and heat).
This layered design ensures comprehensive protection against the various hazards encountered in the harsh environment of space.
Why Polycarbonate?
Polycarbonate is chosen for its desirable properties, including:
- Impact Resistance: It can withstand impacts from small particles, crucial for micrometeoroid protection.
- Optical Clarity: It allows for clear vision for the astronaut.
- Durability: It is a strong and long-lasting material suitable for space missions.
Functions of the Visor
The multi-layered visor assembly performs several critical functions:
- Eye Protection: Shields the astronaut's eyes from intense sunlight, harmful UV radiation, and glare.
- Thermal Control: Helps manage heat transfer, keeping the astronaut comfortable.
- Impact Protection: Guards against impacts from tiny, high-speed micrometeoroids and orbital debris.
- Helmet Protection: Provides a physical buffer that protects the underlying pressure helmet from scratches and damage.
By combining a tough polycarbonate shell with specialized pivoting layers, space suit visors offer astronauts the necessary visibility and protection to work safely outside their spacecraft.
| Component | Primary Material (Shell) | Function(s) |
|---|---|---|
| Extravehicular Visor | Polycarbonate | Protection from light, heat, micrometeoroids; Protects pressure helmet |
